--- swift/docs/CMakeLists.txt.orig	2017-04-21 21:18:29.000000000 +0000
+++ swift/docs/CMakeLists.txt	2018-01-22 08:47:29.543188000 +0000
@@ -11,7 +11,7 @@
 
 SET(SPHINX_ARGS
   -W
-  -D latex_paper_size=${SWIFT_SPHINX_PAPER_SIZE}
+  -D latex_elements.papersize=${SWIFT_SPHINX_PAPER_SIZE}
   -d ${CMAKE_BINARY_DIR}/doctrees)
 
 if(SPHINX_EXECUTABLE)
